Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Prismatic Hexagonalism Pattern No Background
Source GDJ
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
A comeback for you: the popular Escheresque, now in black.
Source Patten
It’s big, it’s gradient—and it’s square.
Source Brankic1979
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki